Based on your expression tree drawing for the expression: 81+9/35 2+7/46, what is the length of the path from node - to node 9 ? Write your answer on the space provided. Based on your expression tree drawing for the expression: 81+9/3 52+7/46, what are the proper ancestors of node 1st * (from left of given infix expression above)? Write your answer on the space provided. (Hint: List the proper ancestors from top to bottom order in the path, separate each proper ancestor symbol by a comma. No spaces.) Based on your expression tree drawing for the expression: 81+9/3 52+7/46, what are the proper descendants of node last * (from left of given infix expression above)? Write your answer on the space provided. (Hint: List the proper descendants from top to bottom and left to right on the same level, separate each proper descendant symbol by a comma. No spaces.) Based on your expression tree drawing for the expression: 81+9/3 52+7/46, what are the ancestors of node 1st / (from left of given infix expression above)? Write your answer on the space provided. (Hint: List the ancestors from top to bottom order in the path, separate each ancestor symbol by a comma. No spaces.) Based on your expression tree drawing for the expression: 81+9/3 52+7/46, what are the descendants of node 1 st + (from left of given infix expression above)? Write your answer on the space provided. (Hint: List the descendants from top to bottom and left to right on the same level, separate each descendant symbol by a comma. No spaces.) Your answer Based on your expression tree drawing for the expression: 8 * 1+ 9/352+7/46, list the nodes visited using DFS traversal (last visit). Write your answer on the space provided. Show complete step-by step solution on your paper. (Hint: List the node symbols separated by a comma. No spaces.)